using System;
using System.Collections;
using Server.Network;
using Server.Items;
using Server.Mobiles;
using Server.Spells;
using Server.Targeting;

namespace Server.Spells.Bushido
{
	public class Evasion : SamuraiSpell
	{
		private static SpellInfo m_Info = new SpellInfo(
				"Evasion", null,
				-1,
				9002
			);

		public override TimeSpan CastDelayBase { get { return TimeSpan.FromSeconds( 0.25 ); } }

		public override double RequiredSkill { get { return 60.0; } }
		public override int RequiredMana { get { return 10; } }

		public override bool CheckCast()
		{
			if( VerifyCast( Caster, true ) )
				return base.CheckCast();

			return false;
		}

		public static bool VerifyCast( Mobile Caster, bool messages )
		{
			if( Caster == null ) // Sanity
				return false;

			BaseWeapon weap = Caster.FindItemOnLayer( Layer.OneHanded ) as BaseWeapon;

			if( weap == null )
				weap = Caster.FindItemOnLayer( Layer.TwoHanded ) as BaseWeapon;

			if ( weap != null ) {
				if ( Core.ML && Caster.Skills[weap.Skill].Base < 50 ) {
					if ( messages ) {
						Caster.SendLocalizedMessage( 1076206 ); // Your skill with your equipped weapon must be 50 or higher to use Evasion.
					}
					return false;
				}
			} else if ( !( Caster.FindItemOnLayer( Layer.TwoHanded ) is BaseShield ) ) {
				if ( messages ) {
					Caster.SendLocalizedMessage( 1062944 ); // You must have a weapon or a shield equipped to use this ability!
				}
				return false;
			}

			if ( !Caster.CanBeginAction( typeof( Evasion ) ) ) {
				if ( messages ) {
					Caster.SendLocalizedMessage( 501789 ); // You must wait before trying again.
				}
				return false;
			}

			return true;
		}

		public static bool CheckSpellEvasion( Mobile defender )
		{
			BaseWeapon weap = defender.FindItemOnLayer( Layer.OneHanded ) as BaseWeapon;

			if ( weap == null )
				weap = defender.FindItemOnLayer( Layer.TwoHanded ) as BaseWeapon;

			if ( Core.ML ) {
				if ( defender.Spell != null && defender.Spell.IsCasting ) {
					return false;
				}
				
				if ( weap != null ) {
					if ( defender.Skills[weap.Skill].Base < 50  ) {
						return false;
					}
				} else if ( !( defender.FindItemOnLayer( Layer.TwoHanded ) is BaseShield ) ) {
					return false;
				}
			}
			
			if ( IsEvading( defender ) && BaseWeapon.CheckParry( defender ) ) {
				defender.Emote( "*evades*" ); // Yes.  Eew.  Blame OSI.
				defender.FixedEffect( 0x37B9, 10, 16 );
				return true;
			}

			return false;
		}

		public Evasion( Mobile caster, Item scroll )
			: base( caster, scroll, m_Info )
		{
		}

		public override void OnBeginCast()
		{
			base.OnBeginCast();

			Caster.FixedEffect( 0x37C4, 10, 7, 4, 3 );
		}

		public override void OnCast()
		{
			if( CheckSequence() )
			{
				Caster.SendLocalizedMessage( 1063120 ); // You feel that you might be able to deflect any attack!
				Caster.FixedParticles( 0x376A, 1, 20, 0x7F5, 0x960, 3, EffectLayer.Waist );
				Caster.PlaySound( 0x51B );

				OnCastSuccessful( Caster );

				BeginEvasion( Caster );

				Caster.BeginAction( typeof( Evasion ) );
				Timer.DelayCall( TimeSpan.FromSeconds( 20.0 ), delegate { Caster.EndAction( typeof( Evasion ) ); } );
			}

			FinishSequence();
		}

		private static Hashtable m_Table = new Hashtable();

		public static bool IsEvading( Mobile m )
		{
			return m_Table.Contains( m );
		}

		public static TimeSpan GetEvadeDuration( Mobile m )
		{

			/* Evasion duration now scales with Bushido skill
			 * 
			 * If the player has higher than GM Bushido, and GM Tactics and Anatomy, they get a 1 second bonus
			 * Evasion duration range:
			 * o 3-6 seconds w/o tactics/anatomy
			 * o 6-7 seconds w/ GM+ Bushido and GM tactics/anatomy 
			 */

			if( !Core.ML )
				return TimeSpan.FromSeconds( 8.0 );

			double seconds = 3;

			if( m.Skills.Bushido.Value > 60 )
				seconds += (m.Skills.Bushido.Value - 60) / 20;

			if( m.Skills.Anatomy.Value >= 100.0 && m.Skills.Tactics.Value >= 100.0 &&  m.Skills.Bushido.Value > 100.0 )	//Bushido being HIGHER than 100 for bonus is intended
				seconds++;

			return TimeSpan.FromSeconds( (int)seconds );
		}

		public static double GetParryScalar( Mobile m )
		{
			/* Evasion modifier to parry now scales with Bushido skill
			 * 
			 * If the player has higher than GM Bushido, and at least GM Tactics and Anatomy, they get a bonus to their evasion modifier (10% bonus to the evasion modifier to parry NOT 10% to the final parry chance)
			 * 
			 * Bonus modifier to parry range: (these are the ranges for the evasion modifier)
			 * o 16-40% bonus w/o tactics/anatomy
			 * o 42-50% bonus w/ GM+ bushido and GM tactics/anatomy
			 */

			if( !Core.ML )
				return 1.5;

			double bonus = 0;

			if( m.Skills.Bushido.Value >= 60 )
				bonus += ( ( ( m.Skills.Bushido.Value - 60 ) * .004 ) + 0.16 );

			if( m.Skills.Anatomy.Value >= 100 && m.Skills.Tactics.Value >= 100 && m.Skills.Bushido.Value > 100 ) //Bushido being HIGHER than 100 for bonus is intended
				bonus += 0.10;

			return 1.0 + bonus;
		}

		public static void BeginEvasion( Mobile m )
		{
			Timer t = (Timer)m_Table[m];

			if( t != null )
				t.Stop();

			t = new InternalTimer( m, GetEvadeDuration( m ) );

			m_Table[m] = t;

			t.Start();
		}

		public static void EndEvasion( Mobile m )
		{
			Timer t = (Timer)m_Table[m];

			if( t != null )
				t.Stop();

			m_Table.Remove( m );

			OnEffectEnd( m, typeof( Evasion ) );
		}

		private class InternalTimer : Timer
		{
			private Mobile m_Mobile;

			public InternalTimer( Mobile m, TimeSpan delay )
				: base( delay )
			{
				m_Mobile = m;
				Priority = TimerPriority.TwoFiftyMS;
			}

			protected override void OnTick()
			{
				EndEvasion( m_Mobile );
				m_Mobile.SendLocalizedMessage( 1063121 ); // You no longer feel that you could deflect any attack.
			}
		}
	}
}
